Burglar alarm



March 8, 1932. K. FUJITA 1,849,003

BURGLAR ALARM Filed June 27. 19:50 2 Sheets-Sheet 1 lllllllllllllllll k mm W" N I"lllllHllnnnmmlmum.... HI IIHW .64-

ATTOR N EY Patented Mar. 8, 1932 N E STA S PATENT. OFFICE} I KUWAKICHI FUJITA, OF HAZLETOIL'PENNSYLVANIA BURGLAR ALARM Application filed 11111527,

The object of this invention is to provide an arrangement embodying some of the features of that disclosed in my United States Patent No. 1,368,791, but includingimprove ments relating to the controlling devices, whereby reliability in operation is assured, Without danger of false operation resulting from vibration and the like.

' v j A further object is to provide for the interposition of safety means adjacent to thehammer exploding the cartridge so that the release both of the'safety means and the cartridge holder by the completion of an electrlc circuit, incident to the forced entry of a build: 5 ing, is required before the hammer is operative for firing purposes.

A further object is to provide for the electrical control, through a plurality of magnets and armatures, of mechanical means adapted 20 to retain and release slidable mechanism,

which in turn rendersthe safety means inactive and causes the movement of the cartridge holding means to operative position with reference to the hammer. With the foregoing and other objects in View, the invention consists in the. novel construction and arrangement hereinafter described, it being understood that modifications may be made within the scope of the 30 claims without departing from the spirit of plane but the cartridge holder is in lower and operative position. V

Figure 5 is a detail view chiefly in perspective, showing certain of the arrangements embodied in the assembly Figure 6 is a detail view, in perspective, showing the manner in which the upper hook 1930. Serial No. 464,292.

engages the barrel or'cartridge holding devices. I I

In this application and in the, patent above referred to an alarm is given by the discharge of a cartridge received by a barrel or cartridge holding device carried by a pivoted block, the latter being operated by. arheavy spring when electrically released and causing the discharge of the cartridge by the .firing if;

mechanism.

A base or the like [designated 10 may. be considered as anpinstrument board in this case, and onithe upper portion thereof I mount a barrel '11 which is receivedrwithin T11 65 a bar'relholder or block 12,.the latter constituting with extension 12' a pivoted bracket movable about an axis defined byrod'or shaft '13.

' Coiled springs 14' surround th end tions of rod 13 and inner spring arms 15 bear on thefbase 1 0. The opposite portion 15 of eachspring arm extends alongside of. block 12 and is turned at 16toward the center and across the surface of recessed portion 17 of the block. This resilient device effects the forcible movement of the block from the position of Figure 3 to the position of Figure 4,

the latterbeing the operative position. The barrel 18 received and'held by the block, is engaged by a pivotedhook 19 mounted on bracket 20 secured to the base 10, and the release of the element 19 by the electric means described below, is required in order that the blank cartridge 21 may be exploded by the firing pin 22 designed to engage stationary hammer 23 mounted in block 2 1 in the base 10.

Safety means prevent false discharge of pad or the like 25 which projects beyond the stationary hammer and which would be engaged by the breach portion of the'barrel 18 unless shifted from the dotted line position of Figure 4 to the full line position thereof;

Vibration due to the discharge of any one piece of apparatus in the system might, through vibration, effect the other-pieces of apparatus, except for the mechanism just described. r j

The system is connected with the appara- I the cartridge, d involve the provision of a on for engagement by the latch arm 44 0f; an.

angle lever. The other arm of this lever is designated 45 and is slotted longitudinally for the accommodation of a pin 46. which is movable through the slot and" is connected with the offset end. 47 of a lever 48, the lever being pivoted at 49. The lever 48 is provided with an upstanding arm 50, and 'a spring or springs 51 connected with the upper-end of arm 50 will also be connected with the stationary member52. This lever 48 is designedto' operate a slidable device carrying lower magnet 35 adapted to release the controlling means described below.

. A lower slide '5 3mounts a bracket 54, and the latter operates vertically between the guides 55' carried by base 10. Bracket 54 includes an upper horizontal portion to which the cor-e 56 of magnet 35-is directly connected, and the" said horizontal portion of the bracket also carries a hook or the like 58 which engages-the lever 48, and the lever is forced to an upper position, shown in Figure 2by the movement ofra pin or operating device 59 having'an enlarged lower end 60 by which. it is controlled. The apparatus is set by'hand pressure, in an upward direction exerted uponuthe end portion 60 of stem or pin 59, resulting in the movement upwardly o-f the bracket 54, and the elevation. of the lever 48, so that the left end of this lever will. move to the position of Figure 2, and the angle arm 44,45 will engage the element'43 of ar mature 40, providing'a form ofjl'atch, re-

leased when armature 40 is drawn upwardly by the energizationof magnet 33 when the contact mechanism of any standard or preferred form, such as that shown in: Figure 1, is operated by'the opening of a door or win.- dow.

The contact mechanism ust referred to includes contact elements 64 and 65-,iand a pin 66 is carried for instance by the window sash 67, the pin or stud 66 normally separating the contacts when the window is closed: and allowing spring contact 64 to engage contact 65 when the sash is raised;

Whereas the housing for the apparatus shown in Figures 2, 3 and 4- may be located at a convenient point, I have shown this housing designated 68 in Figure 1 as being positioned beneath the window frame 69. 'Access may be obtained to the interior by means of doors 70 and 71.

The alarm circuit may be controlled from a door, skylight, or other part of a building or other structure.

Magnet 35is provided with an armature 7 5 to be attracted by core 56 and this armature is rigid with reference to hook 76, the latter being pivoted at 7.7. A stop limits'the movement of the hook and armature in one direction and is designated 77. Pressure toward the left in Figure 3 is placed upon hook 76 by; means of a spring 78. Slide 53 operating between guides 55 is provided with an opening53 and this opening is engaged by hook T 6 in order to retain the slide in. the-position of Figure 4. 8

Upper slide'81 operating'between guides 82 carries anengaging device83, and thecoiled spring 84 passes beneath element 83' and its opposite ends are secured to the base at'85. This spring tends to hold slide 81 in an upper position so that a cutaway'portion in extension 87 on the slide (the opening or cut-away portion being designated 88) cooperates with the rightend of pivote'dho ok 19, as shown in Figures 2 and 3 and also in Figure 4. The fact that the slide is normally moved upwardly by spring 84, insures the engagement of'the barrel 18 in the manner shown inFigure 3, so that the explosive device assumed to be received by the barrel is not in position fordischarge by the firing mechanism, but the apparatus is primed for operation when contact is made as shown in Figure 1 and the magnets 33 and 35 are energized. I

' The circuit being completed through contacts 64 and 65 by the opening of a window or the like, current flows through wire. 32, magnet 33, wire 34, magnet 35, wire 36, contacts 37 and 38, wire 39 to terminal 31. A source of current will of course be included in the circuit, and is not shown in the present drawings. The energization of magnet33 releaseslever 44, 45 when armature40 is attracted, and the lever 48 drawn downwardly by spring or springs 51,. produces the clownward movement of lower slide 53, Engagement takes place between hook 58 and the lever 48 so that these elements move together and bracket 54 mounting magnet 35 moves at the same time and likewise slide 53.

When the lower slide 53 moves downwardly, upper slide.81 also moves downwardly, because engagement between the slides is produced by means of hook 76 as shown in Figure 4. The downward movement of the upper slide 81, in channel member C carries pad 25 downwardly and from the dotted line position of Figure 4 to an active full line position. Slide 81 is guided by stud 23 passing through slot 91. The safety device represented by pad 25 and its operating means,-

now makes it possible for the firing mechanism to discharge the cartridge 21, when the barrel 18 and barrel holding device 12 are released by hook 19 which moves to the position of Figure 4, from the position of Figure 3, upon the aforesaid downward movement of slide 81.

Vibration producing the mechanical release of a trip or the like will not operate the alarm, due to the important fact that both magnets must be electrically energized to permit the joint effect of allowing lower slide 53 to descend under spring action (when released at 43) and causing the upper slide to descend because of the electrical control of hook 7 6 pivoted on the upper side and engaged by the lower slide.

Hooks 76 and 58 do not directly cooperate with each other and are in different planes when looking directly toward base 10 in Figure 3 and in Figure 4.

Hook 76 normally held inactive by spring 78 engages the lower slide onlywhenarmature 75 is attracted and magnet 35 is energized simultaneously with magnet 33. Hook 7 6 constitutes an operating element between the slides 53 and 81, and the oint mechanical and electrical features just referred to are of particular importance in rendering the device effective in carrying out the main objects of the invention.

Means are provided to break the electric circuit which energizes the electro-magnets when the device has operated; A leaf spring 101 normally maintains a pin 102 in inoperative position. When the block 12 is released, the end of the block 12 adjacent to the rod or shaft 13 will engage the leaf spring 101, thus forcing the pin 102 outward to engage the contact member 38 and move the latter away from the contact 37, thus breaking the circuit. When the block is restored to its operative position the pin will be carried back and the circuit will be re-established.

The hereinbefore described construction admits of considerable modification without departing from the invention; therefore, it is the wish not to be limited to the precise arrangements shown and described, which are as aforesaid, by way of illustration merely. In other words the scope of protection contemplated is to be taken solely from the appended claims, interpreted as broadly as is consistent with the prior art.

Having described the invention, the following is claimed 1. In an alarm, relatively movable firing means and receiving means for an explosive element, means holding both of said means out of cooperative relation, a slidable element operatively connected with said holding means to release the latter when moved, a safety element carried by said'slidable element and movable into and out of operative position to prevent or permit engagement of the explosive element with the firing means, and means for operating the slidable element against which the explosive element is driven v by the receiving means, a latch for retaining the receiving means spaced from the firing pin, a slide operatively connected with the latch for releasing the latter, a safety element carried by the slide and disposed adjacent the firing pin in one position of the slide to prevent engagement of the explosive element vwith the pin, and means for effecting movement of the slide to release the latch and simultaneously shift the safety element to a point removed from the firing pin to'permit engagement of the pin with the explosive element.

3. In an alarm, spring-actuated receiving means for an explosive element, a firing pin 7 against which the explosive element is driven byithe receiving means, a latch for retaining the receiving means spaced from the firing pin, a slide operatively connected with the latch for releasing the latter,a safety element carried by the slide and disposed adjacent the firing pin in one position of the slide to prevent engagement of the explosive element 1 with the pin, and means for effecting movement of the slide to release the latch'and simultaneously shift the safety element to a point removed from the firing pin to permit engagement of the pin with the explosive element, said last named means-having an electro-magnetic release, In testimony whereof I hereby affix my signature. KUWAKICHI FUJITA. 

